Subtract 42/80 from 90/7
1st number: 12 6/7, 2nd number: 42/80
90/7 - 42/80 is 3453/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 7 × 80 = 560,
90/7 = 90 × 80/7 × 80 = 7200/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
42/80 = 42 × 7/80 × 7 = 294/560 - Subtract the two like fractions:
7200/560 - 294/560 = 7200 - 294/560 = 6906/560 - After reducing the fraction, the answer is 3453/280
- In mixed form: 1293/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-84/80 90/14-42/80 90/21-42/80 90/35-42/80 90/49-42/80